With all due respect -- and I say that because I know from your posts you do value intellectual honesty -- you have no basis to say there is no "need" for God or an Intelligent Designer.
Simply because we can speculate on numerous possible theories and hypotheses which could be used to explain processes we have yet to more accurately observe and measure, none of which would require an omnipotent, omniscient super-being.
So, on the basis that explanations exist which do not require an omnipotent, omniscient super-being, they are by default *more likely* to be correct as they do not invoke infinitely more complex elements, namely, god(s).
To have a comprehensive theory of what reality is all about, the theory we have about reality requires that it can account for itself.
Well, let's be honest, we don't need a 'comprehensive' theory of 'reality' to be able to accurately describe basic elements of what can be objectively tested, observed and measured, as long as we have the technological tools which can help to minimise on the erroneous frailties of our own perceptions.
We can, and have, achieved a great deal in our short time of applying the scientific method, without needing to say we 'know everything'.
Introducing gods into our hypotheses would be no different to introducing Harry Potter as an explanation for the origin of The Universe. Your philosophical gymnastics notwithstanding, I think we can safely proceed along the lines of ruling out our Universe having been created by a fictional character from a book, if you know what I mean.